This formula additive was developed to work in conjunction with its counter parts, the Micro-Base, Grow # 2 and Bloom # 3 formulas. We have provided two Grow additives because there are two distinctive types of nitrogen commonly used for plant nutrient. Nitrate nitrogen (NO3-N) and ammonium nitrogen (NH4-N). This formula contains only nitrate nitrogen. Nitrate promotes steady, compact, bushy, dark green growth. Nitrate becomes available at a moderate rate making it an excellent nitrogen choice for house plants or long term crops or plant materials with a tight or compact structure. Discourages succulence or elongation particularly under low light conditions. Nitrogen stimulates lush leaf and foliage development. Nitrate nitrogen is often desired for rockwool, because it does not react with medium and remains PH stable. Potassium included to enhance nitrogen and promote healthy stem and root development. Also provides calcium which is often deficient in other commercially available nutrients.